If you don't die from an injury or disease, humans lived about as long as they do today. It's under 5 year old mortality, childbirth and disease and injury tha

If you don't die from an injury or disease, humans lived about as long as they do today. It's under 5 year old mortality, childbirth and disease and injury that made us die more on average which reduced our life expectancy. This means that our actual durability and lifespan hasn't improved that much, just our ability to fix and avoid previously fatal injuries. If humans weren't genetically encoded to die from old age, vs just plain wear and tear like you would with a car, you would statistically see a small amount of humans who lived until 300 today. Just like how there are thousand year old well preserved physical objects today.